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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_SCHED_H |
3 | #define _LINUX_SCHED_H | |
4 | ||
5eca1c10 IM |
5 | /* |
6 | * Define 'struct task_struct' and provide the main scheduler | |
7 | * APIs (schedule(), wakeup variants, etc.) | |
8 | */ | |
b7b3c76a | 9 | |
5eca1c10 | 10 | #include <uapi/linux/sched.h> |
5c228079 | 11 | |
5eca1c10 | 12 | #include <asm/current.h> |
1da177e4 | 13 | |
5eca1c10 | 14 | #include <linux/pid.h> |
1da177e4 | 15 | #include <linux/sem.h> |
ab602f79 | 16 | #include <linux/shm.h> |
5eca1c10 IM |
17 | #include <linux/kcov.h> |
18 | #include <linux/mutex.h> | |
19 | #include <linux/plist.h> | |
20 | #include <linux/hrtimer.h> | |
1da177e4 | 21 | #include <linux/seccomp.h> |
5eca1c10 | 22 | #include <linux/nodemask.h> |
b68070e1 | 23 | #include <linux/rcupdate.h> |
ec1d2819 | 24 | #include <linux/refcount.h> |
a3b6714e | 25 | #include <linux/resource.h> |
9745512c | 26 | #include <linux/latencytop.h> |
5eca1c10 IM |
27 | #include <linux/sched/prio.h> |
28 | #include <linux/signal_types.h> | |
eb414681 | 29 | #include <linux/psi_types.h> |
5eca1c10 IM |
30 | #include <linux/mm_types_task.h> |
31 | #include <linux/task_io_accounting.h> | |
d7822b1e | 32 | #include <linux/rseq.h> |
a3b6714e | 33 | |
5eca1c10 | 34 | /* task_struct member predeclarations (sorted alphabetically): */ |
c7af7877 | 35 | struct audit_context; |
c7af7877 | 36 | struct backing_dev_info; |
bddd87c7 | 37 | struct bio_list; |
73c10101 | 38 | struct blk_plug; |
c7af7877 | 39 | struct cfs_rq; |
c7af7877 IM |
40 | struct fs_struct; |
41 | struct futex_pi_state; | |
42 | struct io_context; | |
43 | struct mempolicy; | |
89076bc3 | 44 | struct nameidata; |
c7af7877 IM |
45 | struct nsproxy; |
46 | struct perf_event_context; | |
47 | struct pid_namespace; | |
48 | struct pipe_inode_info; | |
49 | struct rcu_node; | |
50 | struct reclaim_state; | |
51 | struct robust_list_head; | |
52 | struct sched_attr; | |
53 | struct sched_param; | |
43ae34cb | 54 | struct seq_file; |
c7af7877 IM |
55 | struct sighand_struct; |
56 | struct signal_struct; | |
57 | struct task_delay_info; | |
4cf86d77 | 58 | struct task_group; |
1da177e4 | 59 | |
4a8342d2 LT |
60 | /* |
61 | * Task state bitmask. NOTE! These bits are also | |
62 | * encoded in fs/proc/array.c: get_task_state(). | |
63 | * | |
64 | * We have two separate sets of flags: task->state | |
65 | * is about runnability, while task->exit_state are | |
66 | * about the task exiting. Confusing, but this way | |
67 | * modifying one set can't modify the other one by | |
68 | * mistake. | |
69 | */ | |
5eca1c10 IM |
70 | |
71 | /* Used in tsk->state: */ | |
92c4bc9f PZ |
72 | #define TASK_RUNNING 0x0000 |
73 | #define TASK_INTERRUPTIBLE 0x0001 | |
74 | #define TASK_UNINTERRUPTIBLE 0x0002 | |
75 | #define __TASK_STOPPED 0x0004 | |
76 | #define __TASK_TRACED 0x0008 | |
5eca1c10 | 77 | /* Used in tsk->exit_state: */ |
92c4bc9f PZ |
78 | #define EXIT_DEAD 0x0010 |
79 | #define EXIT_ZOMBIE 0x0020 | |
5eca1c10 IM |
80 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
81 | /* Used in tsk->state again: */ | |
8ef9925b PZ |
82 | #define TASK_PARKED 0x0040 |
83 | #define TASK_DEAD 0x0080 | |
84 | #define TASK_WAKEKILL 0x0100 | |
85 | #define TASK_WAKING 0x0200 | |
92c4bc9f PZ |
86 | #define TASK_NOLOAD 0x0400 |
87 | #define TASK_NEW 0x0800 | |
88 | #define TASK_STATE_MAX 0x1000 | |
5eca1c10 | 89 | |
5eca1c10 IM |
90 | /* Convenience macros for the sake of set_current_state: */ |
91 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
92 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
93 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
94 | ||
95 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) | |
96 | ||
97 | /* Convenience macros for the sake of wake_up(): */ | |
98 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
5eca1c10 IM |
99 | |
100 | /* get_task_state(): */ | |
101 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
102 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ | |
8ef9925b PZ |
103 | __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \ |
104 | TASK_PARKED) | |
5eca1c10 IM |
105 | |
106 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) | |
107 | ||
108 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
109 | ||
110 | #define task_is_stopped_or_traced(task) ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) | |
111 | ||
112 | #define task_contributes_to_load(task) ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ | |
113 | (task->flags & PF_FROZEN) == 0 && \ | |
114 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 115 | |
8eb23b9f PZ |
116 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
117 | ||
b5bf9a90 PZ |
118 | /* |
119 | * Special states are those that do not use the normal wait-loop pattern. See | |
120 | * the comment with set_special_state(). | |
121 | */ | |
122 | #define is_special_task_state(state) \ | |
1cef1150 | 123 | ((state) & (__TASK_STOPPED | __TASK_TRACED | TASK_PARKED | TASK_DEAD)) |
b5bf9a90 | 124 | |
8eb23b9f PZ |
125 | #define __set_current_state(state_value) \ |
126 | do { \ | |
b5bf9a90 | 127 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f PZ |
128 | current->task_state_change = _THIS_IP_; \ |
129 | current->state = (state_value); \ | |
130 | } while (0) | |
b5bf9a90 | 131 | |
8eb23b9f PZ |
132 | #define set_current_state(state_value) \ |
133 | do { \ | |
b5bf9a90 | 134 | WARN_ON_ONCE(is_special_task_state(state_value));\ |
8eb23b9f | 135 | current->task_state_change = _THIS_IP_; \ |
a2250238 | 136 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
137 | } while (0) |
138 | ||
b5bf9a90 PZ |
139 | #define set_special_state(state_value) \ |
140 | do { \ | |
141 | unsigned long flags; /* may shadow */ \ | |
142 | WARN_ON_ONCE(!is_special_task_state(state_value)); \ | |
143 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
144 | current->task_state_change = _THIS_IP_; \ | |
145 | current->state = (state_value); \ | |
146 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ | |
147 | } while (0) | |
8eb23b9f | 148 | #else |
498d0c57 AM |
149 | /* |
150 | * set_current_state() includes a barrier so that the write of current->state | |
151 | * is correctly serialised wrt the caller's subsequent test of whether to | |
152 | * actually sleep: | |
153 | * | |
a2250238 | 154 | * for (;;) { |
498d0c57 | 155 | * set_current_state(TASK_UNINTERRUPTIBLE); |
a2250238 PZ |
156 | * if (!need_sleep) |
157 | * break; | |
158 | * | |
159 | * schedule(); | |
160 | * } | |
161 | * __set_current_state(TASK_RUNNING); | |
162 | * | |
163 | * If the caller does not need such serialisation (because, for instance, the | |
164 | * condition test and condition change and wakeup are under the same lock) then | |
165 | * use __set_current_state(). | |
166 | * | |
167 | * The above is typically ordered against the wakeup, which does: | |
168 | * | |
b5bf9a90 PZ |
169 | * need_sleep = false; |
170 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); | |
a2250238 | 171 | * |
7696f991 AP |
172 | * where wake_up_state() executes a full memory barrier before accessing the |
173 | * task state. | |
a2250238 PZ |
174 | * |
175 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
176 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
177 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 178 | * |
b5bf9a90 | 179 | * However, with slightly different timing the wakeup TASK_RUNNING store can |
dfcb245e | 180 | * also collide with the TASK_UNINTERRUPTIBLE store. Losing that store is not |
b5bf9a90 PZ |
181 | * a problem either because that will result in one extra go around the loop |
182 | * and our @cond test will save the day. | |
498d0c57 | 183 | * |
a2250238 | 184 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 185 | */ |
b5bf9a90 PZ |
186 | #define __set_current_state(state_value) \ |
187 | current->state = (state_value) | |
188 | ||
189 | #define set_current_state(state_value) \ | |
190 | smp_store_mb(current->state, (state_value)) | |
191 | ||
192 | /* | |
193 | * set_special_state() should be used for those states when the blocking task | |
194 | * can not use the regular condition based wait-loop. In that case we must | |
195 | * serialize against wakeups such that any possible in-flight TASK_RUNNING stores | |
196 | * will not collide with our state change. | |
197 | */ | |
198 | #define set_special_state(state_value) \ | |
199 | do { \ | |
200 | unsigned long flags; /* may shadow */ \ | |
201 | raw_spin_lock_irqsave(¤t->pi_lock, flags); \ | |
202 | current->state = (state_value); \ | |
203 | raw_spin_unlock_irqrestore(¤t->pi_lock, flags); \ | |
204 | } while (0) | |
205 | ||
8eb23b9f PZ |
206 | #endif |
207 | ||
5eca1c10 IM |
208 | /* Task command name length: */ |
209 | #define TASK_COMM_LEN 16 | |
1da177e4 | 210 | |
1da177e4 LT |
211 | extern void scheduler_tick(void); |
212 | ||
5eca1c10 IM |
213 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX |
214 | ||
215 | extern long schedule_timeout(long timeout); | |
216 | extern long schedule_timeout_interruptible(long timeout); | |
217 | extern long schedule_timeout_killable(long timeout); | |
218 | extern long schedule_timeout_uninterruptible(long timeout); | |
219 | extern long schedule_timeout_idle(long timeout); | |
1da177e4 | 220 | asmlinkage void schedule(void); |
c5491ea7 | 221 | extern void schedule_preempt_disabled(void); |
1da177e4 | 222 | |
10ab5643 TH |
223 | extern int __must_check io_schedule_prepare(void); |
224 | extern void io_schedule_finish(int token); | |
9cff8ade | 225 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 226 | extern void io_schedule(void); |
9cff8ade | 227 | |
d37f761d | 228 | /** |
0ba42a59 | 229 | * struct prev_cputime - snapshot of system and user cputime |
d37f761d FW |
230 | * @utime: time spent in user mode |
231 | * @stime: time spent in system mode | |
9d7fb042 | 232 | * @lock: protects the above two fields |
d37f761d | 233 | * |
9d7fb042 PZ |
234 | * Stores previous user/system time values such that we can guarantee |
235 | * monotonicity. | |
d37f761d | 236 | */ |
9d7fb042 PZ |
237 | struct prev_cputime { |
238 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5eca1c10 IM |
239 | u64 utime; |
240 | u64 stime; | |
241 | raw_spinlock_t lock; | |
9d7fb042 | 242 | #endif |
d37f761d FW |
243 | }; |
244 | ||
f06febc9 FM |
245 | /** |
246 | * struct task_cputime - collected CPU time counts | |
5613fda9 FW |
247 | * @utime: time spent in user mode, in nanoseconds |
248 | * @stime: time spent in kernel mode, in nanoseconds | |
f06febc9 | 249 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
5ce73a4a | 250 | * |
9d7fb042 PZ |
251 | * This structure groups together three kinds of CPU time that are tracked for |
252 | * threads and thread groups. Most things considering CPU time want to group | |
253 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
254 | */ |
255 | struct task_cputime { | |
5eca1c10 IM |
256 | u64 utime; |
257 | u64 stime; | |
258 | unsigned long long sum_exec_runtime; | |
f06febc9 | 259 | }; |
9d7fb042 | 260 | |
5eca1c10 IM |
261 | /* Alternate field names when used on cache expirations: */ |
262 | #define virt_exp utime | |
263 | #define prof_exp stime | |
264 | #define sched_exp sum_exec_runtime | |
f06febc9 | 265 | |
bac5b6b6 FW |
266 | enum vtime_state { |
267 | /* Task is sleeping or running in a CPU with VTIME inactive: */ | |
268 | VTIME_INACTIVE = 0, | |
269 | /* Task runs in userspace in a CPU with VTIME active: */ | |
270 | VTIME_USER, | |
271 | /* Task runs in kernelspace in a CPU with VTIME active: */ | |
272 | VTIME_SYS, | |
273 | }; | |
274 | ||
275 | struct vtime { | |
276 | seqcount_t seqcount; | |
277 | unsigned long long starttime; | |
278 | enum vtime_state state; | |
2a42eb95 WL |
279 | u64 utime; |
280 | u64 stime; | |
281 | u64 gtime; | |
bac5b6b6 FW |
282 | }; |
283 | ||
1da177e4 | 284 | struct sched_info { |
7f5f8e8d | 285 | #ifdef CONFIG_SCHED_INFO |
5eca1c10 IM |
286 | /* Cumulative counters: */ |
287 | ||
288 | /* # of times we have run on this CPU: */ | |
289 | unsigned long pcount; | |
290 | ||
291 | /* Time spent waiting on a runqueue: */ | |
292 | unsigned long long run_delay; | |
293 | ||
294 | /* Timestamps: */ | |
295 | ||
296 | /* When did we last run on a CPU? */ | |
297 | unsigned long long last_arrival; | |
298 | ||
299 | /* When were we last queued to run? */ | |
300 | unsigned long long last_queued; | |
1da177e4 | 301 | |
f6db8347 | 302 | #endif /* CONFIG_SCHED_INFO */ |
7f5f8e8d | 303 | }; |
1da177e4 | 304 | |
6ecdd749 YD |
305 | /* |
306 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
307 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
308 | * | |
309 | * We define a basic fixed point arithmetic range, and then formalize | |
310 | * all these metrics based on that basic range. | |
311 | */ | |
5eca1c10 IM |
312 | # define SCHED_FIXEDPOINT_SHIFT 10 |
313 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
6ecdd749 | 314 | |
20b8a59f | 315 | struct load_weight { |
5eca1c10 IM |
316 | unsigned long weight; |
317 | u32 inv_weight; | |
20b8a59f IM |
318 | }; |
319 | ||
7f65ea42 PB |
320 | /** |
321 | * struct util_est - Estimation utilization of FAIR tasks | |
322 | * @enqueued: instantaneous estimated utilization of a task/cpu | |
323 | * @ewma: the Exponential Weighted Moving Average (EWMA) | |
324 | * utilization of a task | |
325 | * | |
326 | * Support data structure to track an Exponential Weighted Moving Average | |
327 | * (EWMA) of a FAIR task's utilization. New samples are added to the moving | |
328 | * average each time a task completes an activation. Sample's weight is chosen | |
329 | * so that the EWMA will be relatively insensitive to transient changes to the | |
330 | * task's workload. | |
331 | * | |
332 | * The enqueued attribute has a slightly different meaning for tasks and cpus: | |
333 | * - task: the task's util_avg at last task dequeue time | |
334 | * - cfs_rq: the sum of util_est.enqueued for each RUNNABLE task on that CPU | |
335 | * Thus, the util_est.enqueued of a task represents the contribution on the | |
336 | * estimated utilization of the CPU where that task is currently enqueued. | |
337 | * | |
338 | * Only for tasks we track a moving average of the past instantaneous | |
339 | * estimated utilization. This allows to absorb sporadic drops in utilization | |
340 | * of an otherwise almost periodic task. | |
341 | */ | |
342 | struct util_est { | |
343 | unsigned int enqueued; | |
344 | unsigned int ewma; | |
345 | #define UTIL_EST_WEIGHT_SHIFT 2 | |
317d359d | 346 | } __attribute__((__aligned__(sizeof(u64)))); |
7f65ea42 | 347 | |
9d89c257 | 348 | /* |
7b595334 YD |
349 | * The load_avg/util_avg accumulates an infinite geometric series |
350 | * (see __update_load_avg() in kernel/sched/fair.c). | |
351 | * | |
352 | * [load_avg definition] | |
353 | * | |
354 | * load_avg = runnable% * scale_load_down(load) | |
355 | * | |
356 | * where runnable% is the time ratio that a sched_entity is runnable. | |
357 | * For cfs_rq, it is the aggregated load_avg of all runnable and | |
9d89c257 | 358 | * blocked sched_entities. |
7b595334 | 359 | * |
7b595334 YD |
360 | * [util_avg definition] |
361 | * | |
362 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
363 | * | |
364 | * where running% is the time ratio that a sched_entity is running on | |
365 | * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable | |
366 | * and blocked sched_entities. | |
367 | * | |
23127296 VG |
368 | * load_avg and util_avg don't direcly factor frequency scaling and CPU |
369 | * capacity scaling. The scaling is done through the rq_clock_pelt that | |
370 | * is used for computing those signals (see update_rq_clock_pelt()) | |
7b595334 | 371 | * |
23127296 VG |
372 | * N.B., the above ratios (runnable% and running%) themselves are in the |
373 | * range of [0, 1]. To do fixed point arithmetics, we therefore scale them | |
374 | * to as large a range as necessary. This is for example reflected by | |
375 | * util_avg's SCHED_CAPACITY_SCALE. | |
7b595334 YD |
376 | * |
377 | * [Overflow issue] | |
378 | * | |
379 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
380 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
381 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
382 | * | |
383 | * For all other cases (including 32-bit kernels), struct load_weight's | |
384 | * weight will overflow first before we do, because: | |
385 | * | |
386 | * Max(load_avg) <= Max(load.weight) | |
387 | * | |
388 | * Then it is the load_weight's responsibility to consider overflow | |
389 | * issues. | |
9d89c257 | 390 | */ |
9d85f21c | 391 | struct sched_avg { |
5eca1c10 IM |
392 | u64 last_update_time; |
393 | u64 load_sum; | |
1ea6c46a | 394 | u64 runnable_load_sum; |
5eca1c10 IM |
395 | u32 util_sum; |
396 | u32 period_contrib; | |
397 | unsigned long load_avg; | |
1ea6c46a | 398 | unsigned long runnable_load_avg; |
5eca1c10 | 399 | unsigned long util_avg; |
7f65ea42 | 400 | struct util_est util_est; |
317d359d | 401 | } ____cacheline_aligned; |
9d85f21c | 402 | |
41acab88 | 403 | struct sched_statistics { |
7f5f8e8d | 404 | #ifdef CONFIG_SCHEDSTATS |
5eca1c10 IM |
405 | u64 wait_start; |
406 | u64 wait_max; | |
407 | u64 wait_count; | |
408 | u64 wait_sum; | |
409 | u64 iowait_count; | |
410 | u64 iowait_sum; | |
411 | ||
412 | u64 sleep_start; | |
413 | u64 sleep_max; | |
414 | s64 sum_sleep_runtime; | |
415 | ||
416 | u64 block_start; | |
417 | u64 block_max; | |
418 | u64 exec_max; | |
419 | u64 slice_max; | |
420 | ||
421 | u64 nr_migrations_cold; | |
422 | u64 nr_failed_migrations_affine; | |
423 | u64 nr_failed_migrations_running; | |
424 | u64 nr_failed_migrations_hot; | |
425 | u64 nr_forced_migrations; | |
426 | ||
427 | u64 nr_wakeups; | |
428 | u64 nr_wakeups_sync; | |
429 | u64 nr_wakeups_migrate; | |
430 | u64 nr_wakeups_local; | |
431 | u64 nr_wakeups_remote; | |
432 | u64 nr_wakeups_affine; | |
433 | u64 nr_wakeups_affine_attempts; | |
434 | u64 nr_wakeups_passive; | |
435 | u64 nr_wakeups_idle; | |
41acab88 | 436 | #endif |
7f5f8e8d | 437 | }; |
41acab88 LDM |
438 | |
439 | struct sched_entity { | |
5eca1c10 IM |
440 | /* For load-balancing: */ |
441 | struct load_weight load; | |
1ea6c46a | 442 | unsigned long runnable_weight; |
5eca1c10 IM |
443 | struct rb_node run_node; |
444 | struct list_head group_node; | |
445 | unsigned int on_rq; | |
41acab88 | 446 | |
5eca1c10 IM |
447 | u64 exec_start; |
448 | u64 sum_exec_runtime; | |
449 | u64 vruntime; | |
450 | u64 prev_sum_exec_runtime; | |
41acab88 | 451 | |
5eca1c10 | 452 | u64 nr_migrations; |
41acab88 | 453 | |
5eca1c10 | 454 | struct sched_statistics statistics; |
94c18227 | 455 | |
20b8a59f | 456 | #ifdef CONFIG_FAIR_GROUP_SCHED |
5eca1c10 IM |
457 | int depth; |
458 | struct sched_entity *parent; | |
20b8a59f | 459 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 460 | struct cfs_rq *cfs_rq; |
20b8a59f | 461 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 462 | struct cfs_rq *my_q; |
20b8a59f | 463 | #endif |
8bd75c77 | 464 | |
141965c7 | 465 | #ifdef CONFIG_SMP |
5a107804 JO |
466 | /* |
467 | * Per entity load average tracking. | |
468 | * | |
469 | * Put into separate cache line so it does not | |
470 | * collide with read-mostly values above. | |
471 | */ | |
317d359d | 472 | struct sched_avg avg; |
9d85f21c | 473 | #endif |
20b8a59f | 474 | }; |
70b97a7f | 475 | |
fa717060 | 476 | struct sched_rt_entity { |
5eca1c10 IM |
477 | struct list_head run_list; |
478 | unsigned long timeout; | |
479 | unsigned long watchdog_stamp; | |
480 | unsigned int time_slice; | |
481 | unsigned short on_rq; | |
482 | unsigned short on_list; | |
483 | ||
484 | struct sched_rt_entity *back; | |
052f1dc7 | 485 | #ifdef CONFIG_RT_GROUP_SCHED |
5eca1c10 | 486 | struct sched_rt_entity *parent; |
6f505b16 | 487 | /* rq on which this entity is (to be) queued: */ |
5eca1c10 | 488 | struct rt_rq *rt_rq; |
6f505b16 | 489 | /* rq "owned" by this entity/group: */ |
5eca1c10 | 490 | struct rt_rq *my_q; |
6f505b16 | 491 | #endif |
3859a271 | 492 | } __randomize_layout; |
fa717060 | 493 | |
aab03e05 | 494 | struct sched_dl_entity { |
5eca1c10 | 495 | struct rb_node rb_node; |
aab03e05 DF |
496 | |
497 | /* | |
498 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 499 | * during sched_setattr(), they will remain the same until |
500 | * the next sched_setattr(). | |
aab03e05 | 501 | */ |
5eca1c10 IM |
502 | u64 dl_runtime; /* Maximum runtime for each instance */ |
503 | u64 dl_deadline; /* Relative deadline of each instance */ | |
504 | u64 dl_period; /* Separation of two instances (period) */ | |
54d6d303 | 505 | u64 dl_bw; /* dl_runtime / dl_period */ |
3effcb42 | 506 | u64 dl_density; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
507 | |
508 | /* | |
509 | * Actual scheduling parameters. Initialized with the values above, | |
dfcb245e | 510 | * they are continuously updated during task execution. Note that |
aab03e05 DF |
511 | * the remaining runtime could be < 0 in case we are in overrun. |
512 | */ | |
5eca1c10 IM |
513 | s64 runtime; /* Remaining runtime for this instance */ |
514 | u64 deadline; /* Absolute deadline for this instance */ | |
515 | unsigned int flags; /* Specifying the scheduler behaviour */ | |
aab03e05 DF |
516 | |
517 | /* | |
518 | * Some bool flags: | |
519 | * | |
520 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
521 | * task has to wait for a replenishment to be performed at the | |
522 | * next firing of dl_timer. | |
523 | * | |
2d3d891d DF |
524 | * @dl_boosted tells if we are boosted due to DI. If so we are |
525 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
526 | * exit the critical section); |
527 | * | |
5eca1c10 | 528 | * @dl_yielded tells if task gave up the CPU before consuming |
5bfd126e | 529 | * all its available runtime during the last job. |
209a0cbd LA |
530 | * |
531 | * @dl_non_contending tells if the task is inactive while still | |
532 | * contributing to the active utilization. In other words, it | |
533 | * indicates if the inactive timer has been armed and its handler | |
534 | * has not been executed yet. This flag is useful to avoid race | |
535 | * conditions between the inactive timer handler and the wakeup | |
536 | * code. | |
34be3930 JL |
537 | * |
538 | * @dl_overrun tells if the task asked to be informed about runtime | |
539 | * overruns. | |
aab03e05 | 540 | */ |
aa5222e9 DC |
541 | unsigned int dl_throttled : 1; |
542 | unsigned int dl_boosted : 1; | |
543 | unsigned int dl_yielded : 1; | |
544 | unsigned int dl_non_contending : 1; | |
34be3930 | 545 | unsigned int dl_overrun : 1; |
aab03e05 DF |
546 | |
547 | /* | |
548 | * Bandwidth enforcement timer. Each -deadline task has its | |
549 | * own bandwidth to be enforced, thus we need one timer per task. | |
550 | */ | |
5eca1c10 | 551 | struct hrtimer dl_timer; |
209a0cbd LA |
552 | |
553 | /* | |
554 | * Inactive timer, responsible for decreasing the active utilization | |
555 | * at the "0-lag time". When a -deadline task blocks, it contributes | |
556 | * to GRUB's active utilization until the "0-lag time", hence a | |
557 | * timer is needed to decrease the active utilization at the correct | |
558 | * time. | |
559 | */ | |
560 | struct hrtimer inactive_timer; | |
aab03e05 | 561 | }; |
8bd75c77 | 562 | |
1d082fd0 PM |
563 | union rcu_special { |
564 | struct { | |
5eca1c10 IM |
565 | u8 blocked; |
566 | u8 need_qs; | |
05f41571 PM |
567 | u8 exp_hint; /* Hint for performance. */ |
568 | u8 pad; /* No garbage from compiler! */ | |
8203d6d0 | 569 | } b; /* Bits. */ |
05f41571 | 570 | u32 s; /* Set of bits. */ |
1d082fd0 | 571 | }; |
86848966 | 572 | |
8dc85d54 PZ |
573 | enum perf_event_task_context { |
574 | perf_invalid_context = -1, | |
575 | perf_hw_context = 0, | |
89a1e187 | 576 | perf_sw_context, |
8dc85d54 PZ |
577 | perf_nr_task_contexts, |
578 | }; | |
579 | ||
eb61baf6 IM |
580 | struct wake_q_node { |
581 | struct wake_q_node *next; | |
582 | }; | |
583 | ||
1da177e4 | 584 | struct task_struct { |
c65eacbe AL |
585 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
586 | /* | |
587 | * For reasons of header soup (see current_thread_info()), this | |
588 | * must be the first element of task_struct. | |
589 | */ | |
5eca1c10 | 590 | struct thread_info thread_info; |
c65eacbe | 591 | #endif |
5eca1c10 IM |
592 | /* -1 unrunnable, 0 runnable, >0 stopped: */ |
593 | volatile long state; | |
29e48ce8 KC |
594 | |
595 | /* | |
596 | * This begins the randomizable portion of task_struct. Only | |
597 | * scheduling-critical items should be added above here. | |
598 | */ | |
599 | randomized_struct_fields_start | |
600 | ||
5eca1c10 | 601 | void *stack; |
ec1d2819 | 602 | refcount_t usage; |
5eca1c10 IM |
603 | /* Per task flags (PF_*), defined further below: */ |
604 | unsigned int flags; | |
605 | unsigned int ptrace; | |
1da177e4 | 606 | |
2dd73a4f | 607 | #ifdef CONFIG_SMP |
5eca1c10 IM |
608 | struct llist_node wake_entry; |
609 | int on_cpu; | |
c65eacbe | 610 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 IM |
611 | /* Current CPU: */ |
612 | unsigned int cpu; | |
c65eacbe | 613 | #endif |
5eca1c10 IM |
614 | unsigned int wakee_flips; |
615 | unsigned long wakee_flip_decay_ts; | |
616 | struct task_struct *last_wakee; | |
ac66f547 | 617 | |
32e839dd MG |
618 | /* |
619 | * recent_used_cpu is initially set as the last CPU used by a task | |
620 | * that wakes affine another task. Waker/wakee relationships can | |
621 | * push tasks around a CPU where each wakeup moves to the next one. | |
622 | * Tracking a recently used CPU allows a quick search for a recently | |
623 | * used CPU that may be idle. | |
624 | */ | |
625 | int recent_used_cpu; | |
5eca1c10 | 626 | int wake_cpu; |
2dd73a4f | 627 | #endif |
5eca1c10 IM |
628 | int on_rq; |
629 | ||
630 | int prio; | |
631 | int static_prio; | |
632 | int normal_prio; | |
633 | unsigned int rt_priority; | |
50e645a8 | 634 | |
5eca1c10 IM |
635 | const struct sched_class *sched_class; |
636 | struct sched_entity se; | |
637 | struct sched_rt_entity rt; | |
8323f26c | 638 | #ifdef CONFIG_CGROUP_SCHED |
5eca1c10 | 639 | struct task_group *sched_task_group; |
8323f26c | 640 | #endif |
5eca1c10 | 641 | struct sched_dl_entity dl; |
1da177e4 | 642 | |
e107be36 | 643 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
5eca1c10 IM |
644 | /* List of struct preempt_notifier: */ |
645 | struct hlist_head preempt_notifiers; | |
e107be36 AK |
646 | #endif |
647 | ||
6c5c9341 | 648 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
5eca1c10 | 649 | unsigned int btrace_seq; |
6c5c9341 | 650 | #endif |
1da177e4 | 651 | |
5eca1c10 IM |
652 | unsigned int policy; |
653 | int nr_cpus_allowed; | |
654 | cpumask_t cpus_allowed; | |
1da177e4 | 655 | |
a57eb940 | 656 | #ifdef CONFIG_PREEMPT_RCU |
5eca1c10 IM |
657 | int rcu_read_lock_nesting; |
658 | union rcu_special rcu_read_unlock_special; | |
659 | struct list_head rcu_node_entry; | |
660 | struct rcu_node *rcu_blocked_node; | |
28f6569a | 661 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
5eca1c10 | 662 | |
8315f422 | 663 | #ifdef CONFIG_TASKS_RCU |
5eca1c10 | 664 | unsigned long rcu_tasks_nvcsw; |
ccdd29ff PM |
665 | u8 rcu_tasks_holdout; |
666 | u8 rcu_tasks_idx; | |
5eca1c10 | 667 | int rcu_tasks_idle_cpu; |
ccdd29ff | 668 | struct list_head rcu_tasks_holdout_list; |
8315f422 | 669 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 670 | |
5eca1c10 | 671 | struct sched_info sched_info; |
1da177e4 | 672 | |
5eca1c10 | 673 | struct list_head tasks; |
806c09a7 | 674 | #ifdef CONFIG_SMP |
5eca1c10 IM |
675 | struct plist_node pushable_tasks; |
676 | struct rb_node pushable_dl_tasks; | |
806c09a7 | 677 | #endif |
1da177e4 | 678 | |
5eca1c10 IM |
679 | struct mm_struct *mm; |
680 | struct mm_struct *active_mm; | |
314ff785 IM |
681 | |
682 | /* Per-thread vma caching: */ | |
5eca1c10 | 683 | struct vmacache vmacache; |
314ff785 | 684 | |
5eca1c10 IM |
685 | #ifdef SPLIT_RSS_COUNTING |
686 | struct task_rss_stat rss_stat; | |
34e55232 | 687 | #endif |
5eca1c10 IM |
688 | int exit_state; |
689 | int exit_code; | |
690 | int exit_signal; | |
691 | /* The signal sent when the parent dies: */ | |
692 | int pdeath_signal; | |
693 | /* JOBCTL_*, siglock protected: */ | |
694 | unsigned long jobctl; | |
695 | ||
696 | /* Used for emulating ABI behavior of previous Linux versions: */ | |
697 | unsigned int personality; | |
698 | ||
699 | /* Scheduler bits, serialized by scheduler locks: */ | |
700 | unsigned sched_reset_on_fork:1; | |
701 | unsigned sched_contributes_to_load:1; | |
702 | unsigned sched_migrated:1; | |
703 | unsigned sched_remote_wakeup:1; | |
eb414681 JW |
704 | #ifdef CONFIG_PSI |
705 | unsigned sched_psi_wake_requeue:1; | |
706 | #endif | |
707 | ||
5eca1c10 IM |
708 | /* Force alignment to the next boundary: */ |
709 | unsigned :0; | |
710 | ||
711 | /* Unserialized, strictly 'current' */ | |
712 | ||
713 | /* Bit to tell LSMs we're in execve(): */ | |
714 | unsigned in_execve:1; | |
715 | unsigned in_iowait:1; | |
716 | #ifndef TIF_RESTORE_SIGMASK | |
717 | unsigned restore_sigmask:1; | |
7e781418 | 718 | #endif |
626ebc41 | 719 | #ifdef CONFIG_MEMCG |
29ef680a | 720 | unsigned in_user_fault:1; |
127424c8 | 721 | #endif |
ff303e66 | 722 | #ifdef CONFIG_COMPAT_BRK |
5eca1c10 | 723 | unsigned brk_randomized:1; |
ff303e66 | 724 | #endif |
77f88796 TH |
725 | #ifdef CONFIG_CGROUPS |
726 | /* disallow userland-initiated cgroup migration */ | |
727 | unsigned no_cgroup_migration:1; | |
728 | #endif | |
d09d8df3 JB |
729 | #ifdef CONFIG_BLK_CGROUP |
730 | /* to be used once the psi infrastructure lands upstream. */ | |
731 | unsigned use_memdelay:1; | |
732 | #endif | |
6f185c29 | 733 | |
9da3f2b7 JH |
734 | /* |
735 | * May usercopy functions fault on kernel addresses? | |
736 | * This is not just a single bit because this can potentially nest. | |
737 | */ | |
738 | unsigned int kernel_uaccess_faults_ok; | |
739 | ||
5eca1c10 | 740 | unsigned long atomic_flags; /* Flags requiring atomic access. */ |
1d4457f9 | 741 | |
5eca1c10 | 742 | struct restart_block restart_block; |
f56141e3 | 743 | |
5eca1c10 IM |
744 | pid_t pid; |
745 | pid_t tgid; | |
0a425405 | 746 | |
050e9baa | 747 | #ifdef CONFIG_STACKPROTECTOR |
5eca1c10 IM |
748 | /* Canary value for the -fstack-protector GCC feature: */ |
749 | unsigned long stack_canary; | |
1314562a | 750 | #endif |
4d1d61a6 | 751 | /* |
5eca1c10 | 752 | * Pointers to the (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 753 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 754 | * p->real_parent->pid) |
1da177e4 | 755 | */ |
5eca1c10 IM |
756 | |
757 | /* Real parent process: */ | |
758 | struct task_struct __rcu *real_parent; | |
759 | ||
760 | /* Recipient of SIGCHLD, wait4() reports: */ | |
761 | struct task_struct __rcu *parent; | |
762 | ||
1da177e4 | 763 | /* |
5eca1c10 | 764 | * Children/sibling form the list of natural children: |
1da177e4 | 765 | */ |
5eca1c10 IM |
766 | struct list_head children; |
767 | struct list_head sibling; | |
768 | struct task_struct *group_leader; | |
1da177e4 | 769 | |
f470021a | 770 | /* |
5eca1c10 IM |
771 | * 'ptraced' is the list of tasks this task is using ptrace() on. |
772 | * | |
f470021a | 773 | * This includes both natural children and PTRACE_ATTACH targets. |
5eca1c10 | 774 | * 'ptrace_entry' is this task's link on the p->parent->ptraced list. |
f470021a | 775 | */ |
5eca1c10 IM |
776 | struct list_head ptraced; |
777 | struct list_head ptrace_entry; | |
f470021a | 778 | |
1da177e4 | 779 | /* PID/PID hash table linkage. */ |
2c470475 EB |
780 | struct pid *thread_pid; |
781 | struct hlist_node pid_links[PIDTYPE_MAX]; | |
5eca1c10 IM |
782 | struct list_head thread_group; |
783 | struct list_head thread_node; | |
784 | ||
785 | struct completion *vfork_done; | |
1da177e4 | 786 | |
5eca1c10 IM |
787 | /* CLONE_CHILD_SETTID: */ |
788 | int __user *set_child_tid; | |
1da177e4 | 789 | |
5eca1c10 IM |
790 | /* CLONE_CHILD_CLEARTID: */ |
791 | int __user *clear_child_tid; | |
792 | ||
793 | u64 utime; | |
794 | u64 stime; | |
40565b5a | 795 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5eca1c10 IM |
796 | u64 utimescaled; |
797 | u64 stimescaled; | |
40565b5a | 798 | #endif |
5eca1c10 IM |
799 | u64 gtime; |
800 | struct prev_cputime prev_cputime; | |
6a61671b | 801 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6 | 802 | struct vtime vtime; |
d99ca3b9 | 803 | #endif |
d027d45d FW |
804 | |
805 | #ifdef CONFIG_NO_HZ_FULL | |
5eca1c10 | 806 | atomic_t tick_dep_mask; |
d027d45d | 807 | #endif |
5eca1c10 IM |
808 | /* Context switch counts: */ |
809 | unsigned long nvcsw; | |
810 | unsigned long nivcsw; | |
811 | ||
812 | /* Monotonic time in nsecs: */ | |
813 | u64 start_time; | |
814 | ||
815 | /* Boot based time in nsecs: */ | |
816 | u64 real_start_time; | |
817 | ||
818 | /* MM fault and swap info: this can arguably be seen as either mm-specific or thread-specific: */ | |
819 | unsigned long min_flt; | |
820 | unsigned long maj_flt; | |
1da177e4 | 821 | |
b18b6a9c | 822 | #ifdef CONFIG_POSIX_TIMERS |
5eca1c10 IM |
823 | struct task_cputime cputime_expires; |
824 | struct list_head cpu_timers[3]; | |
b18b6a9c | 825 | #endif |
1da177e4 | 826 | |
5eca1c10 IM |
827 | /* Process credentials: */ |
828 | ||
829 | /* Tracer's credentials at attach: */ | |
830 | const struct cred __rcu *ptracer_cred; | |
831 | ||
832 | /* Objective and real subjective task credentials (COW): */ | |
833 | const struct cred __rcu *real_cred; | |
834 | ||
835 | /* Effective (overridable) subjective task credentials (COW): */ | |
836 | const struct cred __rcu *cred; | |
837 | ||
838 | /* | |
839 | * executable name, excluding path. | |
840 | * | |
841 | * - normally initialized setup_new_exec() | |
842 | * - access it with [gs]et_task_comm() | |
843 | * - lock it with task_lock() | |
844 | */ | |
845 | char comm[TASK_COMM_LEN]; | |
846 | ||
847 | struct nameidata *nameidata; | |
848 | ||
3d5b6fcc | 849 | #ifdef CONFIG_SYSVIPC |
5eca1c10 IM |
850 | struct sysv_sem sysvsem; |
851 | struct sysv_shm sysvshm; | |
3d5b6fcc | 852 | #endif |
e162b39a | 853 | #ifdef CONFIG_DETECT_HUNG_TASK |
5eca1c10 | 854 | unsigned long last_switch_count; |
a2e51445 | 855 | unsigned long last_switch_time; |
82a1fcb9 | 856 | #endif |
5eca1c10 IM |
857 | /* Filesystem information: */ |
858 | struct fs_struct *fs; | |
859 | ||
860 | /* Open file information: */ | |
861 | struct files_struct *files; | |
862 | ||
863 | /* Namespaces: */ | |
864 | struct nsproxy *nsproxy; | |
865 | ||
866 | /* Signal handlers: */ | |
867 | struct signal_struct *signal; | |
868 | struct sighand_struct *sighand; | |
869 | sigset_t blocked; | |
870 | sigset_t real_blocked; | |
871 | /* Restored if set_restore_sigmask() was used: */ | |
872 | sigset_t saved_sigmask; | |
873 | struct sigpending pending; | |
874 | unsigned long sas_ss_sp; | |
875 | size_t sas_ss_size; | |
876 | unsigned int sas_ss_flags; | |
877 | ||
878 | struct callback_head *task_works; | |
879 | ||
880 | struct audit_context *audit_context; | |
bfef93a5 | 881 | #ifdef CONFIG_AUDITSYSCALL |
5eca1c10 IM |
882 | kuid_t loginuid; |
883 | unsigned int sessionid; | |
bfef93a5 | 884 | #endif |
5eca1c10 IM |
885 | struct seccomp seccomp; |
886 | ||
887 | /* Thread group tracking: */ | |
888 | u32 parent_exec_id; | |
889 | u32 self_exec_id; | |
1da177e4 | 890 | |
5eca1c10 IM |
891 | /* Protection against (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, mempolicy: */ |
892 | spinlock_t alloc_lock; | |
1da177e4 | 893 | |
b29739f9 | 894 | /* Protection of the PI data structures: */ |
5eca1c10 | 895 | raw_spinlock_t pi_lock; |
b29739f9 | 896 | |
5eca1c10 | 897 | struct wake_q_node wake_q; |
76751049 | 898 | |
23f78d4a | 899 | #ifdef CONFIG_RT_MUTEXES |
5eca1c10 | 900 | /* PI waiters blocked on a rt_mutex held by this task: */ |
a23ba907 | 901 | struct rb_root_cached pi_waiters; |
e96a7705 XP |
902 | /* Updated under owner's pi_lock and rq lock */ |
903 | struct task_struct *pi_top_task; | |
5eca1c10 IM |
904 | /* Deadlock detection and priority inheritance handling: */ |
905 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
906 | #endif |
907 | ||
408894ee | 908 | #ifdef CONFIG_DEBUG_MUTEXES |
5eca1c10 IM |
909 | /* Mutex deadlock detection: */ |
910 | struct mutex_waiter *blocked_on; | |
408894ee | 911 | #endif |
5eca1c10 | 912 | |
de30a2b3 | 913 | #ifdef CONFIG_TRACE_IRQFLAGS |
5eca1c10 IM |
914 | unsigned int irq_events; |
915 | unsigned long hardirq_enable_ip; | |
916 | unsigned long hardirq_disable_ip; | |
917 | unsigned int hardirq_enable_event; | |
918 | unsigned int hardirq_disable_event; | |
919 | int hardirqs_enabled; | |
920 | int hardirq_context; | |
921 | unsigned long softirq_disable_ip; | |
922 | unsigned long softirq_enable_ip; | |
923 | unsigned int softirq_disable_event; | |
924 | unsigned int softirq_enable_event; | |
925 | int softirqs_enabled; | |
926 | int softirq_context; | |
de30a2b3 | 927 | #endif |
5eca1c10 | 928 | |
fbb9ce95 | 929 | #ifdef CONFIG_LOCKDEP |
5eca1c10 IM |
930 | # define MAX_LOCK_DEPTH 48UL |
931 | u64 curr_chain_key; | |
932 | int lockdep_depth; | |
933 | unsigned int lockdep_recursion; | |
934 | struct held_lock held_locks[MAX_LOCK_DEPTH]; | |
fbb9ce95 | 935 | #endif |
5eca1c10 | 936 | |
c6d30853 | 937 | #ifdef CONFIG_UBSAN |
5eca1c10 | 938 | unsigned int in_ubsan; |
c6d30853 | 939 | #endif |
408894ee | 940 | |
5eca1c10 IM |
941 | /* Journalling filesystem info: */ |
942 | void *journal_info; | |
1da177e4 | 943 | |
5eca1c10 IM |
944 | /* Stacked block device info: */ |
945 | struct bio_list *bio_list; | |
d89d8796 | 946 | |
73c10101 | 947 | #ifdef CONFIG_BLOCK |
5eca1c10 IM |
948 | /* Stack plugging: */ |
949 | struct blk_plug *plug; | |
73c10101 JA |
950 | #endif |
951 | ||
5eca1c10 IM |
952 | /* VM state: */ |
953 | struct reclaim_state *reclaim_state; | |
954 | ||
955 | struct backing_dev_info *backing_dev_info; | |
1da177e4 | 956 | |
5eca1c10 | 957 | struct io_context *io_context; |
1da177e4 | 958 | |
5eca1c10 IM |
959 | /* Ptrace state: */ |
960 | unsigned long ptrace_message; | |
ae7795bc | 961 | kernel_siginfo_t *last_siginfo; |
1da177e4 | 962 | |
5eca1c10 | 963 | struct task_io_accounting ioac; |
eb414681 JW |
964 | #ifdef CONFIG_PSI |
965 | /* Pressure stall state */ | |
966 | unsigned int psi_flags; | |
967 | #endif | |
5eca1c10 IM |
968 | #ifdef CONFIG_TASK_XACCT |
969 | /* Accumulated RSS usage: */ | |
970 | u64 acct_rss_mem1; | |
971 | /* Accumulated virtual memory usage: */ | |
972 | u64 acct_vm_mem1; | |
973 | /* stime + utime since last update: */ | |
974 | u64 acct_timexpd; | |
1da177e4 LT |
975 | #endif |
976 | #ifdef CONFIG_CPUSETS | |
5eca1c10 IM |
977 | /* Protected by ->alloc_lock: */ |
978 | nodemask_t mems_allowed; | |
979 | /* Seqence number to catch updates: */ | |
980 | seqcount_t mems_allowed_seq; | |
981 | int cpuset_mem_spread_rotor; | |
982 | int cpuset_slab_spread_rotor; | |
1da177e4 | 983 | #endif |
ddbcc7e8 | 984 | #ifdef CONFIG_CGROUPS |
5eca1c10 IM |
985 | /* Control Group info protected by css_set_lock: */ |
986 | struct css_set __rcu *cgroups; | |
987 | /* cg_list protected by css_set_lock and tsk->alloc_lock: */ | |
988 | struct list_head cg_list; | |
ddbcc7e8 | 989 | #endif |
90802938 | 990 | #ifdef CONFIG_X86_RESCTRL |
0734ded1 | 991 | u32 closid; |
d6aaba61 | 992 | u32 rmid; |
e02737d5 | 993 | #endif |
42b2dd0a | 994 | #ifdef CONFIG_FUTEX |
5eca1c10 | 995 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
996 | #ifdef CONFIG_COMPAT |
997 | struct compat_robust_list_head __user *compat_robust_list; | |
998 | #endif | |
5eca1c10 IM |
999 | struct list_head pi_state_list; |
1000 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1001 | #endif |
cdd6c482 | 1002 | #ifdef CONFIG_PERF_EVENTS |
5eca1c10 IM |
1003 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
1004 | struct mutex perf_event_mutex; | |
1005 | struct list_head perf_event_list; | |
a63eaf34 | 1006 | #endif |
8f47b187 | 1007 | #ifdef CONFIG_DEBUG_PREEMPT |
5eca1c10 | 1008 | unsigned long preempt_disable_ip; |
8f47b187 | 1009 | #endif |
c7aceaba | 1010 | #ifdef CONFIG_NUMA |
5eca1c10 IM |
1011 | /* Protected by alloc_lock: */ |
1012 | struct mempolicy *mempolicy; | |
45816682 | 1013 | short il_prev; |
5eca1c10 | 1014 | short pref_node_fork; |
42b2dd0a | 1015 | #endif |
cbee9f88 | 1016 | #ifdef CONFIG_NUMA_BALANCING |
5eca1c10 IM |
1017 | int numa_scan_seq; |
1018 | unsigned int numa_scan_period; | |
1019 | unsigned int numa_scan_period_max; | |
1020 | int numa_preferred_nid; | |
1021 | unsigned long numa_migrate_retry; | |
1022 | /* Migration stamp: */ | |
1023 | u64 node_stamp; | |
1024 | u64 last_task_numa_placement; | |
1025 | u64 last_sum_exec_runtime; | |
1026 | struct callback_head numa_work; | |
1027 | ||
5eca1c10 | 1028 | struct numa_group *numa_group; |
8c8a743c | 1029 | |
745d6147 | 1030 | /* |
44dba3d5 IM |
1031 | * numa_faults is an array split into four regions: |
1032 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1033 | * in this precise order. | |
1034 | * | |
1035 | * faults_memory: Exponential decaying average of faults on a per-node | |
1036 | * basis. Scheduling placement decisions are made based on these | |
1037 | * counts. The values remain static for the duration of a PTE scan. | |
1038 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1039 | * hinting fault was incurred. | |
1040 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1041 | * during the current scan window. When the scan completes, the counts | |
1042 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1043 | */ |
5eca1c10 IM |
1044 | unsigned long *numa_faults; |
1045 | unsigned long total_numa_faults; | |
745d6147 | 1046 | |
04bb2f94 RR |
1047 | /* |
1048 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1049 | * scan window were remote/local or failed to migrate. The task scan |
1050 | * period is adapted based on the locality of the faults with different | |
1051 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1052 | */ |
5eca1c10 | 1053 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1054 | |
5eca1c10 | 1055 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1056 | #endif /* CONFIG_NUMA_BALANCING */ |
1057 | ||
d7822b1e MD |
1058 | #ifdef CONFIG_RSEQ |
1059 | struct rseq __user *rseq; | |
1060 | u32 rseq_len; | |
1061 | u32 rseq_sig; | |
1062 | /* | |
1063 | * RmW on rseq_event_mask must be performed atomically | |
1064 | * with respect to preemption. | |
1065 | */ | |
1066 | unsigned long rseq_event_mask; | |
1067 | #endif | |
1068 | ||
5eca1c10 | 1069 | struct tlbflush_unmap_batch tlb_ubc; |
72b252ae | 1070 | |
5eca1c10 | 1071 | struct rcu_head rcu; |
b92ce558 | 1072 | |
5eca1c10 IM |
1073 | /* Cache last used pipe for splice(): */ |
1074 | struct pipe_inode_info *splice_pipe; | |
5640f768 | 1075 | |
5eca1c10 | 1076 | struct page_frag task_frag; |
5640f768 | 1077 | |
47913d4e IM |
1078 | #ifdef CONFIG_TASK_DELAY_ACCT |
1079 | struct task_delay_info *delays; | |
f4f154fd | 1080 | #endif |
47913d4e | 1081 | |
f4f154fd | 1082 | #ifdef CONFIG_FAULT_INJECTION |
5eca1c10 | 1083 | int make_it_fail; |
9049f2f6 | 1084 | unsigned int fail_nth; |
ca74e92b | 1085 | #endif |
9d823e8f | 1086 | /* |
5eca1c10 IM |
1087 | * When (nr_dirtied >= nr_dirtied_pause), it's time to call |
1088 | * balance_dirty_pages() for a dirty throttling pause: | |
9d823e8f | 1089 | */ |
5eca1c10 IM |
1090 | int nr_dirtied; |
1091 | int nr_dirtied_pause; | |
1092 | /* Start of a write-and-pause period: */ | |
1093 | unsigned long dirty_paused_when; | |
9d823e8f | 1094 | |
9745512c | 1095 | #ifdef CONFIG_LATENCYTOP |
5eca1c10 IM |
1096 | int latency_record_count; |
1097 | struct latency_record latency_record[LT_SAVECOUNT]; | |
9745512c | 1098 | #endif |
6976675d | 1099 | /* |
5eca1c10 | 1100 | * Time slack values; these are used to round up poll() and |
6976675d AV |
1101 | * select() etc timeout values. These are in nanoseconds. |
1102 | */ | |
5eca1c10 IM |
1103 | u64 timer_slack_ns; |
1104 | u64 default_timer_slack_ns; | |
f8d570a4 | 1105 | |
0b24becc | 1106 | #ifdef CONFIG_KASAN |
5eca1c10 | 1107 | unsigned int kasan_depth; |
0b24becc | 1108 | #endif |
5eca1c10 | 1109 | |
fb52607a | 1110 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
5eca1c10 IM |
1111 | /* Index of current stored address in ret_stack: */ |
1112 | int curr_ret_stack; | |
39eb456d | 1113 | int curr_ret_depth; |
5eca1c10 IM |
1114 | |
1115 | /* Stack of return addresses for return function tracing: */ | |
1116 | struct ftrace_ret_stack *ret_stack; | |
1117 | ||
1118 | /* Timestamp for last schedule: */ | |
1119 | unsigned long long ftrace_timestamp; | |
1120 | ||
f201ae23 FW |
1121 | /* |
1122 | * Number of functions that haven't been traced | |
5eca1c10 | 1123 | * because of depth overrun: |
f201ae23 | 1124 | */ |
5eca1c10 IM |
1125 | atomic_t trace_overrun; |
1126 | ||
1127 | /* Pause tracing: */ | |
1128 | atomic_t tracing_graph_pause; | |
f201ae23 | 1129 | #endif |
5eca1c10 | 1130 | |
ea4e2bc4 | 1131 | #ifdef CONFIG_TRACING |
5eca1c10 IM |
1132 | /* State flags for use by tracers: */ |
1133 | unsigned long trace; | |
1134 | ||
1135 | /* Bitmask and counter of trace recursion: */ | |
1136 | unsigned long trace_recursion; | |
261842b7 | 1137 | #endif /* CONFIG_TRACING */ |
5eca1c10 | 1138 | |
5c9a8750 | 1139 | #ifdef CONFIG_KCOV |
5eca1c10 | 1140 | /* Coverage collection mode enabled for this task (0 if disabled): */ |
0ed557aa | 1141 | unsigned int kcov_mode; |
5eca1c10 IM |
1142 | |
1143 | /* Size of the kcov_area: */ | |
1144 | unsigned int kcov_size; | |
1145 | ||
1146 | /* Buffer for coverage collection: */ | |
1147 | void *kcov_area; | |
1148 | ||
1149 | /* KCOV descriptor wired with this task or NULL: */ | |
1150 | struct kcov *kcov; | |
5c9a8750 | 1151 | #endif |
5eca1c10 | 1152 | |
6f185c29 | 1153 | #ifdef CONFIG_MEMCG |
5eca1c10 IM |
1154 | struct mem_cgroup *memcg_in_oom; |
1155 | gfp_t memcg_oom_gfp_mask; | |
1156 | int memcg_oom_order; | |
b23afb93 | 1157 | |
5eca1c10 IM |
1158 | /* Number of pages to reclaim on returning to userland: */ |
1159 | unsigned int memcg_nr_pages_over_high; | |
d46eb14b SB |
1160 | |
1161 | /* Used by memcontrol for targeted memcg charge: */ | |
1162 | struct mem_cgroup *active_memcg; | |
569b846d | 1163 | #endif |
5eca1c10 | 1164 | |
d09d8df3 JB |
1165 | #ifdef CONFIG_BLK_CGROUP |
1166 | struct request_queue *throttle_queue; | |
1167 | #endif | |
1168 | ||
0326f5a9 | 1169 | #ifdef CONFIG_UPROBES |
5eca1c10 | 1170 | struct uprobe_task *utask; |
0326f5a9 | 1171 | #endif |
cafe5635 | 1172 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
5eca1c10 IM |
1173 | unsigned int sequential_io; |
1174 | unsigned int sequential_io_avg; | |
cafe5635 | 1175 | #endif |
8eb23b9f | 1176 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
5eca1c10 | 1177 | unsigned long task_state_change; |
8eb23b9f | 1178 | #endif |
5eca1c10 | 1179 | int pagefault_disabled; |
03049269 | 1180 | #ifdef CONFIG_MMU |
5eca1c10 | 1181 | struct task_struct *oom_reaper_list; |
03049269 | 1182 | #endif |
ba14a194 | 1183 | #ifdef CONFIG_VMAP_STACK |
5eca1c10 | 1184 | struct vm_struct *stack_vm_area; |
ba14a194 | 1185 | #endif |
68f24b08 | 1186 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
5eca1c10 | 1187 | /* A live task holds one reference: */ |
f0b89d39 | 1188 | refcount_t stack_refcount; |
d83a7cb3 JP |
1189 | #endif |
1190 | #ifdef CONFIG_LIVEPATCH | |
1191 | int patch_state; | |
0302e28d | 1192 | #endif |
e4e55b47 TH |
1193 | #ifdef CONFIG_SECURITY |
1194 | /* Used by LSM modules for access restriction: */ | |
1195 | void *security; | |
68f24b08 | 1196 | #endif |
29e48ce8 | 1197 | |
afaef01c AP |
1198 | #ifdef CONFIG_GCC_PLUGIN_STACKLEAK |
1199 | unsigned long lowest_stack; | |
c8d12627 | 1200 | unsigned long prev_lowest_stack; |
afaef01c AP |
1201 | #endif |
1202 | ||
29e48ce8 KC |
1203 | /* |
1204 | * New fields for task_struct should be added above here, so that | |
1205 | * they are included in the randomized portion of task_struct. | |
1206 | */ | |
1207 | randomized_struct_fields_end | |
1208 | ||
5eca1c10 IM |
1209 | /* CPU-specific state of this task: */ |
1210 | struct thread_struct thread; | |
1211 | ||
1212 | /* | |
1213 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1214 | * structure. It *MUST* be at the end of 'task_struct'. | |
1215 | * | |
1216 | * Do not put anything below here! | |
1217 | */ | |
1da177e4 LT |
1218 | }; |
1219 | ||
e868171a | 1220 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 | 1221 | { |
2c470475 | 1222 | return task->thread_pid; |
22c935f4 EB |
1223 | } |
1224 | ||
7af57294 PE |
1225 | /* |
1226 | * the helpers to get the task's different pids as they are seen | |
1227 | * from various namespaces | |
1228 | * | |
1229 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1230 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1231 | * current. | |
7af57294 PE |
1232 | * task_xid_nr_ns() : id seen from the ns specified; |
1233 | * | |
7af57294 PE |
1234 | * see also pid_nr() etc in include/linux/pid.h |
1235 | */ | |
5eca1c10 | 1236 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, struct pid_namespace *ns); |
7af57294 | 1237 | |
e868171a | 1238 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1239 | { |
1240 | return tsk->pid; | |
1241 | } | |
1242 | ||
5eca1c10 | 1243 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
52ee2dfd ON |
1244 | { |
1245 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1246 | } | |
7af57294 PE |
1247 | |
1248 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1249 | { | |
52ee2dfd | 1250 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1251 | } |
1252 | ||
1253 | ||
e868171a | 1254 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1255 | { |
1256 | return tsk->tgid; | |
1257 | } | |
1258 | ||
5eca1c10 IM |
1259 | /** |
1260 | * pid_alive - check that a task structure is not stale | |
1261 | * @p: Task structure to be checked. | |
1262 | * | |
1263 | * Test if a process is not yet dead (at most zombie state) | |
1264 | * If pid_alive fails, then pointers within the task structure | |
1265 | * can be stale and must not be dereferenced. | |
1266 | * | |
1267 | * Return: 1 if the process is alive. 0 otherwise. | |
1268 | */ | |
1269 | static inline int pid_alive(const struct task_struct *p) | |
1270 | { | |
2c470475 | 1271 | return p->thread_pid != NULL; |
5eca1c10 | 1272 | } |
7af57294 | 1273 | |
5eca1c10 | 1274 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1275 | { |
52ee2dfd | 1276 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1277 | } |
1278 | ||
7af57294 PE |
1279 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1280 | { | |
52ee2dfd | 1281 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1282 | } |
1283 | ||
1284 | ||
5eca1c10 | 1285 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
7af57294 | 1286 | { |
52ee2dfd | 1287 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1288 | } |
1289 | ||
7af57294 PE |
1290 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1291 | { | |
52ee2dfd | 1292 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1293 | } |
1294 | ||
dd1c1f2f ON |
1295 | static inline pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns) |
1296 | { | |
6883f81a | 1297 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, ns); |
dd1c1f2f ON |
1298 | } |
1299 | ||
1300 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1301 | { | |
6883f81a | 1302 | return __task_pid_nr_ns(tsk, PIDTYPE_TGID, NULL); |
dd1c1f2f ON |
1303 | } |
1304 | ||
1305 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) | |
1306 | { | |
1307 | pid_t pid = 0; | |
1308 | ||
1309 | rcu_read_lock(); | |
1310 | if (pid_alive(tsk)) | |
1311 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1312 | rcu_read_unlock(); | |
1313 | ||
1314 | return pid; | |
1315 | } | |
1316 | ||
1317 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1318 | { | |
1319 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1320 | } | |
1321 | ||
5eca1c10 | 1322 | /* Obsolete, do not use: */ |
1b0f7ffd ON |
1323 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) |
1324 | { | |
1325 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1326 | } | |
7af57294 | 1327 | |
06eb6184 PZ |
1328 | #define TASK_REPORT_IDLE (TASK_REPORT + 1) |
1329 | #define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1) | |
1330 | ||
1d48b080 | 1331 | static inline unsigned int task_state_index(struct task_struct *tsk) |
20435d84 | 1332 | { |
1593baab PZ |
1333 | unsigned int tsk_state = READ_ONCE(tsk->state); |
1334 | unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT; | |
20435d84 | 1335 | |
06eb6184 PZ |
1336 | BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX); |
1337 | ||
06eb6184 PZ |
1338 | if (tsk_state == TASK_IDLE) |
1339 | state = TASK_REPORT_IDLE; | |
1340 | ||
1593baab PZ |
1341 | return fls(state); |
1342 | } | |
1343 | ||
1d48b080 | 1344 | static inline char task_index_to_char(unsigned int state) |
1593baab | 1345 | { |
8ef9925b | 1346 | static const char state_char[] = "RSDTtXZPI"; |
1593baab | 1347 | |
06eb6184 | 1348 | BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1); |
20435d84 | 1349 | |
1593baab PZ |
1350 | return state_char[state]; |
1351 | } | |
1352 | ||
1353 | static inline char task_state_to_char(struct task_struct *tsk) | |
1354 | { | |
1d48b080 | 1355 | return task_index_to_char(task_state_index(tsk)); |
20435d84 XX |
1356 | } |
1357 | ||
f400e198 | 1358 | /** |
570f5241 SS |
1359 | * is_global_init - check if a task structure is init. Since init |
1360 | * is free to have sub-threads we need to check tgid. | |
3260259f H |
1361 | * @tsk: Task structure to be checked. |
1362 | * | |
1363 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1364 | * |
1365 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1366 | */ |
e868171a | 1367 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1368 | { |
570f5241 | 1369 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1370 | } |
b460cbc5 | 1371 | |
9ec52099 CLG |
1372 | extern struct pid *cad_pid; |
1373 | ||
1da177e4 LT |
1374 | /* |
1375 | * Per process flags | |
1376 | */ | |
5eca1c10 IM |
1377 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1378 | #define PF_EXITING 0x00000004 /* Getting shut down */ | |
1379 | #define PF_EXITPIDONE 0x00000008 /* PI exit done on shut down */ | |
1380 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ | |
1381 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ | |
1382 | #define PF_FORKNOEXEC 0x00000040 /* Forked but didn't exec */ | |
1383 | #define PF_MCE_PROCESS 0x00000080 /* Process policy on mce errors */ | |
1384 | #define PF_SUPERPRIV 0x00000100 /* Used super-user privileges */ | |
1385 | #define PF_DUMPCORE 0x00000200 /* Dumped core */ | |
1386 | #define PF_SIGNALED 0x00000400 /* Killed by a signal */ | |
1387 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1388 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user() noticed that RLIMIT_NPROC was exceeded */ | |
1389 | #define PF_USED_MATH 0x00002000 /* If unset the fpu must be initialized before use */ | |
1390 | #define PF_USED_ASYNC 0x00004000 /* Used async_schedule*(), used by module init */ | |
1391 | #define PF_NOFREEZE 0x00008000 /* This thread should not be frozen */ | |
1392 | #define PF_FROZEN 0x00010000 /* Frozen for system suspend */ | |
7dea19f9 MH |
1393 | #define PF_KSWAPD 0x00020000 /* I am kswapd */ |
1394 | #define PF_MEMALLOC_NOFS 0x00040000 /* All allocation requests will inherit GFP_NOFS */ | |
1395 | #define PF_MEMALLOC_NOIO 0x00080000 /* All allocation requests will inherit GFP_NOIO */ | |
5eca1c10 IM |
1396 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
1397 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ | |
1398 | #define PF_RANDOMIZE 0x00400000 /* Randomize virtual address space */ | |
1399 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
eb414681 | 1400 | #define PF_MEMSTALL 0x01000000 /* Stalled due to lack of memory */ |
73ab1cb2 | 1401 | #define PF_UMH 0x02000000 /* I'm an Usermodehelper process */ |
5eca1c10 IM |
1402 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
1403 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ | |
5eca1c10 IM |
1404 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1405 | #define PF_SUSPEND_TASK 0x80000000 /* This thread called freeze_processes() and should not be frozen */ | |
1da177e4 LT |
1406 | |
1407 | /* | |
1408 | * Only the _current_ task can read/write to tsk->flags, but other | |
1409 | * tasks can access tsk->flags in readonly mode for example | |
1410 | * with tsk_used_math (like during threaded core dumping). | |
1411 | * There is however an exception to this rule during ptrace | |
1412 | * or during fork: the ptracer task is allowed to write to the | |
1413 | * child->flags of its traced child (same goes for fork, the parent | |
1414 | * can write to the child->flags), because we're guaranteed the | |
1415 | * child is not running and in turn not changing child->flags | |
1416 | * at the same time the parent does it. | |
1417 | */ | |
5eca1c10 IM |
1418 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) |
1419 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1420 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1421 | #define set_used_math() set_stopped_child_used_math(current) | |
1422 | ||
1da177e4 LT |
1423 | #define conditional_stopped_child_used_math(condition, child) \ |
1424 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
5eca1c10 IM |
1425 | |
1426 | #define conditional_used_math(condition) conditional_stopped_child_used_math(condition, current) | |
1427 | ||
1da177e4 LT |
1428 | #define copy_to_stopped_child_used_math(child) \ |
1429 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
5eca1c10 | 1430 | |
1da177e4 | 1431 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ |
5eca1c10 IM |
1432 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) |
1433 | #define used_math() tsk_used_math(current) | |
1da177e4 | 1434 | |
62ec05dd TG |
1435 | static inline bool is_percpu_thread(void) |
1436 | { | |
1437 | #ifdef CONFIG_SMP | |
1438 | return (current->flags & PF_NO_SETAFFINITY) && | |
1439 | (current->nr_cpus_allowed == 1); | |
1440 | #else | |
1441 | return true; | |
1442 | #endif | |
1443 | } | |
1444 | ||
1d4457f9 | 1445 | /* Per-process atomic flags. */ |
5eca1c10 IM |
1446 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
1447 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ | |
1448 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
356e4bff TG |
1449 | #define PFA_SPEC_SSB_DISABLE 3 /* Speculative Store Bypass disabled */ |
1450 | #define PFA_SPEC_SSB_FORCE_DISABLE 4 /* Speculative Store Bypass force disabled*/ | |
9137bb27 TG |
1451 | #define PFA_SPEC_IB_DISABLE 5 /* Indirect branch speculation restricted */ |
1452 | #define PFA_SPEC_IB_FORCE_DISABLE 6 /* Indirect branch speculation permanently restricted */ | |
1d4457f9 | 1453 | |
e0e5070b ZL |
1454 | #define TASK_PFA_TEST(name, func) \ |
1455 | static inline bool task_##func(struct task_struct *p) \ | |
1456 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1457 | |
e0e5070b ZL |
1458 | #define TASK_PFA_SET(name, func) \ |
1459 | static inline void task_set_##func(struct task_struct *p) \ | |
1460 | { set_bit(PFA_##name, &p->atomic_flags); } | |
5eca1c10 | 1461 | |
e0e5070b ZL |
1462 | #define TASK_PFA_CLEAR(name, func) \ |
1463 | static inline void task_clear_##func(struct task_struct *p) \ | |
1464 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1465 | ||
1466 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1467 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1468 | |
2ad654bc ZL |
1469 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1470 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1471 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1472 | ||
1473 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1474 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1475 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1476 | |
356e4bff TG |
1477 | TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable) |
1478 | TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1479 | TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable) | |
1480 | ||
1481 | TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1482 | TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable) | |
1483 | ||
9137bb27 TG |
1484 | TASK_PFA_TEST(SPEC_IB_DISABLE, spec_ib_disable) |
1485 | TASK_PFA_SET(SPEC_IB_DISABLE, spec_ib_disable) | |
1486 | TASK_PFA_CLEAR(SPEC_IB_DISABLE, spec_ib_disable) | |
1487 | ||
1488 | TASK_PFA_TEST(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1489 | TASK_PFA_SET(SPEC_IB_FORCE_DISABLE, spec_ib_force_disable) | |
1490 | ||
5eca1c10 | 1491 | static inline void |
717a94b5 | 1492 | current_restore_flags(unsigned long orig_flags, unsigned long flags) |
907aed48 | 1493 | { |
717a94b5 N |
1494 | current->flags &= ~flags; |
1495 | current->flags |= orig_flags & flags; | |
907aed48 MG |
1496 | } |
1497 | ||
5eca1c10 IM |
1498 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, const struct cpumask *trial); |
1499 | extern int task_can_attach(struct task_struct *p, const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1500 | #ifdef CONFIG_SMP |
5eca1c10 IM |
1501 | extern void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask); |
1502 | extern int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask); | |
1da177e4 | 1503 | #else |
5eca1c10 | 1504 | static inline void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask) |
1e1b6c51 KM |
1505 | { |
1506 | } | |
5eca1c10 | 1507 | static inline int set_cpus_allowed_ptr(struct task_struct *p, const struct cpumask *new_mask) |
1da177e4 | 1508 | { |
96f874e2 | 1509 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1510 | return -EINVAL; |
1511 | return 0; | |
1512 | } | |
1513 | #endif | |
e0ad9556 | 1514 | |
6d0d2878 CB |
1515 | #ifndef cpu_relax_yield |
1516 | #define cpu_relax_yield() cpu_relax() | |
1517 | #endif | |
1518 | ||
fa93384f | 1519 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1520 | extern void set_user_nice(struct task_struct *p, long nice); |
1521 | extern int task_prio(const struct task_struct *p); | |
5eca1c10 | 1522 | |
d0ea0268 DY |
1523 | /** |
1524 | * task_nice - return the nice value of a given task. | |
1525 | * @p: the task in question. | |
1526 | * | |
1527 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1528 | */ | |
1529 | static inline int task_nice(const struct task_struct *p) | |
1530 | { | |
1531 | return PRIO_TO_NICE((p)->static_prio); | |
1532 | } | |
5eca1c10 | 1533 | |
36c8b586 IM |
1534 | extern int can_nice(const struct task_struct *p, const int nice); |
1535 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1536 | extern int idle_cpu(int cpu); |
943d355d | 1537 | extern int available_idle_cpu(int cpu); |
5eca1c10 IM |
1538 | extern int sched_setscheduler(struct task_struct *, int, const struct sched_param *); |
1539 | extern int sched_setscheduler_nocheck(struct task_struct *, int, const struct sched_param *); | |
1540 | extern int sched_setattr(struct task_struct *, const struct sched_attr *); | |
794a56eb | 1541 | extern int sched_setattr_nocheck(struct task_struct *, const struct sched_attr *); |
36c8b586 | 1542 | extern struct task_struct *idle_task(int cpu); |
5eca1c10 | 1543 | |
c4f30608 PM |
1544 | /** |
1545 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1546 | * @p: the task in question. |
e69f6186 YB |
1547 | * |
1548 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1549 | */ |
7061ca3b | 1550 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1551 | { |
c1de45ca | 1552 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1553 | } |
5eca1c10 | 1554 | |
36c8b586 | 1555 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1556 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1557 | |
1558 | void yield(void); | |
1559 | ||
1da177e4 | 1560 | union thread_union { |
0500871f DH |
1561 | #ifndef CONFIG_ARCH_TASK_STRUCT_ON_STACK |
1562 | struct task_struct task; | |
1563 | #endif | |
c65eacbe | 1564 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1565 | struct thread_info thread_info; |
c65eacbe | 1566 | #endif |
1da177e4 LT |
1567 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1568 | }; | |
1569 | ||
0500871f DH |
1570 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1571 | extern struct thread_info init_thread_info; | |
1572 | #endif | |
1573 | ||
1574 | extern unsigned long init_stack[THREAD_SIZE / sizeof(unsigned long)]; | |
1575 | ||
f3ac6067 IM |
1576 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1577 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
1578 | { | |
1579 | return &task->thread_info; | |
1580 | } | |
1581 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
1582 | # define task_thread_info(task) ((struct thread_info *)(task)->stack) | |
1583 | #endif | |
1584 | ||
198fe21b PE |
1585 | /* |
1586 | * find a task by one of its numerical ids | |
1587 | * | |
198fe21b PE |
1588 | * find_task_by_pid_ns(): |
1589 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1590 | * find_task_by_vpid(): |
1591 | * finds a task by its virtual pid | |
198fe21b | 1592 | * |
e49859e7 | 1593 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1594 | */ |
1595 | ||
228ebcbe | 1596 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
5eca1c10 | 1597 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, struct pid_namespace *ns); |
198fe21b | 1598 | |
2ee08260 MR |
1599 | /* |
1600 | * find a task by its virtual pid and get the task struct | |
1601 | */ | |
1602 | extern struct task_struct *find_get_task_by_vpid(pid_t nr); | |
1603 | ||
b3c97528 HH |
1604 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1605 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1606 | extern void wake_up_new_task(struct task_struct *tsk); |
5eca1c10 | 1607 | |
1da177e4 | 1608 | #ifdef CONFIG_SMP |
5eca1c10 | 1609 | extern void kick_process(struct task_struct *tsk); |
1da177e4 | 1610 | #else |
5eca1c10 | 1611 | static inline void kick_process(struct task_struct *tsk) { } |
1da177e4 | 1612 | #endif |
1da177e4 | 1613 | |
82b89778 | 1614 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
5eca1c10 | 1615 | |
82b89778 AH |
1616 | static inline void set_task_comm(struct task_struct *tsk, const char *from) |
1617 | { | |
1618 | __set_task_comm(tsk, from, false); | |
1619 | } | |
5eca1c10 | 1620 | |
3756f640 AB |
1621 | extern char *__get_task_comm(char *to, size_t len, struct task_struct *tsk); |
1622 | #define get_task_comm(buf, tsk) ({ \ | |
1623 | BUILD_BUG_ON(sizeof(buf) != TASK_COMM_LEN); \ | |
1624 | __get_task_comm(buf, sizeof(buf), tsk); \ | |
1625 | }) | |
1da177e4 LT |
1626 | |
1627 | #ifdef CONFIG_SMP | |
317f3941 | 1628 | void scheduler_ipi(void); |
85ba2d86 | 1629 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 1630 | #else |
184748cc | 1631 | static inline void scheduler_ipi(void) { } |
5eca1c10 | 1632 | static inline unsigned long wait_task_inactive(struct task_struct *p, long match_state) |
85ba2d86 RM |
1633 | { |
1634 | return 1; | |
1635 | } | |
1da177e4 LT |
1636 | #endif |
1637 | ||
5eca1c10 IM |
1638 | /* |
1639 | * Set thread flags in other task's structures. | |
1640 | * See asm/thread_info.h for TIF_xxxx flags available: | |
1da177e4 LT |
1641 | */ |
1642 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1643 | { | |
a1261f54 | 1644 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1645 | } |
1646 | ||
1647 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1648 | { | |
a1261f54 | 1649 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1650 | } |
1651 | ||
93ee37c2 DM |
1652 | static inline void update_tsk_thread_flag(struct task_struct *tsk, int flag, |
1653 | bool value) | |
1654 | { | |
1655 | update_ti_thread_flag(task_thread_info(tsk), flag, value); | |
1656 | } | |
1657 | ||
1da177e4 LT |
1658 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
1659 | { | |
a1261f54 | 1660 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1661 | } |
1662 | ||
1663 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1664 | { | |
a1261f54 | 1665 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1666 | } |
1667 | ||
1668 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
1669 | { | |
a1261f54 | 1670 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
1671 | } |
1672 | ||
1673 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
1674 | { | |
1675 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1676 | } | |
1677 | ||
1678 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
1679 | { | |
1680 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
1681 | } | |
1682 | ||
8ae121ac GH |
1683 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
1684 | { | |
1685 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
1686 | } | |
1687 | ||
1da177e4 LT |
1688 | /* |
1689 | * cond_resched() and cond_resched_lock(): latency reduction via | |
1690 | * explicit rescheduling in places that are safe. The return | |
1691 | * value indicates whether a reschedule was done in fact. | |
1692 | * cond_resched_lock() will drop the spinlock before scheduling, | |
1da177e4 | 1693 | */ |
35a773a0 | 1694 | #ifndef CONFIG_PREEMPT |
c3921ab7 | 1695 | extern int _cond_resched(void); |
35a773a0 PZ |
1696 | #else |
1697 | static inline int _cond_resched(void) { return 0; } | |
1698 | #endif | |
6f80bd98 | 1699 | |
613afbf8 | 1700 | #define cond_resched() ({ \ |
3427445a | 1701 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
1702 | _cond_resched(); \ |
1703 | }) | |
6f80bd98 | 1704 | |
613afbf8 FW |
1705 | extern int __cond_resched_lock(spinlock_t *lock); |
1706 | ||
1707 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 1708 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
1709 | __cond_resched_lock(lock); \ |
1710 | }) | |
1711 | ||
f6f3c437 SH |
1712 | static inline void cond_resched_rcu(void) |
1713 | { | |
1714 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
1715 | rcu_read_unlock(); | |
1716 | cond_resched(); | |
1717 | rcu_read_lock(); | |
1718 | #endif | |
1719 | } | |
1720 | ||
1da177e4 LT |
1721 | /* |
1722 | * Does a critical section need to be broken due to another | |
95c354fe NP |
1723 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
1724 | * but a general need for low latency) | |
1da177e4 | 1725 | */ |
95c354fe | 1726 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 1727 | { |
95c354fe NP |
1728 | #ifdef CONFIG_PREEMPT |
1729 | return spin_is_contended(lock); | |
1730 | #else | |
1da177e4 | 1731 | return 0; |
95c354fe | 1732 | #endif |
1da177e4 LT |
1733 | } |
1734 | ||
75f93fed PZ |
1735 | static __always_inline bool need_resched(void) |
1736 | { | |
1737 | return unlikely(tif_need_resched()); | |
1738 | } | |
1739 | ||
1da177e4 LT |
1740 | /* |
1741 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
1742 | */ | |
1743 | #ifdef CONFIG_SMP | |
1744 | ||
1745 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1746 | { | |
c65eacbe AL |
1747 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1748 | return p->cpu; | |
1749 | #else | |
a1261f54 | 1750 | return task_thread_info(p)->cpu; |
c65eacbe | 1751 | #endif |
1da177e4 LT |
1752 | } |
1753 | ||
c65cc870 | 1754 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
1755 | |
1756 | #else | |
1757 | ||
1758 | static inline unsigned int task_cpu(const struct task_struct *p) | |
1759 | { | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
1764 | { | |
1765 | } | |
1766 | ||
1767 | #endif /* CONFIG_SMP */ | |
1768 | ||
d9345c65 PX |
1769 | /* |
1770 | * In order to reduce various lock holder preemption latencies provide an | |
1771 | * interface to see if a vCPU is currently running or not. | |
1772 | * | |
1773 | * This allows us to terminate optimistic spin loops and block, analogous to | |
1774 | * the native optimistic spin heuristic of testing if the lock owner task is | |
1775 | * running or not. | |
1776 | */ | |
1777 | #ifndef vcpu_is_preempted | |
1778 | # define vcpu_is_preempted(cpu) false | |
1779 | #endif | |
1780 | ||
96f874e2 RR |
1781 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
1782 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 1783 | |
82455257 DH |
1784 | #ifndef TASK_SIZE_OF |
1785 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
1786 | #endif | |
1787 | ||
d7822b1e MD |
1788 | #ifdef CONFIG_RSEQ |
1789 | ||
1790 | /* | |
1791 | * Map the event mask on the user-space ABI enum rseq_cs_flags | |
1792 | * for direct mask checks. | |
1793 | */ | |
1794 | enum rseq_event_mask_bits { | |
1795 | RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT, | |
1796 | RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT, | |
1797 | RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT, | |
1798 | }; | |
1799 | ||
1800 | enum rseq_event_mask { | |
1801 | RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT), | |
1802 | RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT), | |
1803 | RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT), | |
1804 | }; | |
1805 | ||
1806 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
1807 | { | |
1808 | if (t->rseq) | |
1809 | set_tsk_thread_flag(t, TIF_NOTIFY_RESUME); | |
1810 | } | |
1811 | ||
784e0300 | 1812 | void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs); |
d7822b1e | 1813 | |
784e0300 WD |
1814 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
1815 | struct pt_regs *regs) | |
d7822b1e MD |
1816 | { |
1817 | if (current->rseq) | |
784e0300 | 1818 | __rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
1819 | } |
1820 | ||
784e0300 WD |
1821 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
1822 | struct pt_regs *regs) | |
d7822b1e MD |
1823 | { |
1824 | preempt_disable(); | |
1825 | __set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask); | |
1826 | preempt_enable(); | |
784e0300 | 1827 | rseq_handle_notify_resume(ksig, regs); |
d7822b1e MD |
1828 | } |
1829 | ||
1830 | /* rseq_preempt() requires preemption to be disabled. */ | |
1831 | static inline void rseq_preempt(struct task_struct *t) | |
1832 | { | |
1833 | __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); | |
1834 | rseq_set_notify_resume(t); | |
1835 | } | |
1836 | ||
1837 | /* rseq_migrate() requires preemption to be disabled. */ | |
1838 | static inline void rseq_migrate(struct task_struct *t) | |
1839 | { | |
1840 | __set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask); | |
1841 | rseq_set_notify_resume(t); | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * If parent process has a registered restartable sequences area, the | |
9a789fcf | 1846 | * child inherits. Only applies when forking a process, not a thread. |
d7822b1e MD |
1847 | */ |
1848 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
1849 | { | |
1850 | if (clone_flags & CLONE_THREAD) { | |
1851 | t->rseq = NULL; | |
1852 | t->rseq_len = 0; | |
1853 | t->rseq_sig = 0; | |
1854 | t->rseq_event_mask = 0; | |
1855 | } else { | |
1856 | t->rseq = current->rseq; | |
1857 | t->rseq_len = current->rseq_len; | |
1858 | t->rseq_sig = current->rseq_sig; | |
1859 | t->rseq_event_mask = current->rseq_event_mask; | |
d7822b1e MD |
1860 | } |
1861 | } | |
1862 | ||
1863 | static inline void rseq_execve(struct task_struct *t) | |
1864 | { | |
1865 | t->rseq = NULL; | |
1866 | t->rseq_len = 0; | |
1867 | t->rseq_sig = 0; | |
1868 | t->rseq_event_mask = 0; | |
1869 | } | |
1870 | ||
1871 | #else | |
1872 | ||
1873 | static inline void rseq_set_notify_resume(struct task_struct *t) | |
1874 | { | |
1875 | } | |
784e0300 WD |
1876 | static inline void rseq_handle_notify_resume(struct ksignal *ksig, |
1877 | struct pt_regs *regs) | |
d7822b1e MD |
1878 | { |
1879 | } | |
784e0300 WD |
1880 | static inline void rseq_signal_deliver(struct ksignal *ksig, |
1881 | struct pt_regs *regs) | |
d7822b1e MD |
1882 | { |
1883 | } | |
1884 | static inline void rseq_preempt(struct task_struct *t) | |
1885 | { | |
1886 | } | |
1887 | static inline void rseq_migrate(struct task_struct *t) | |
1888 | { | |
1889 | } | |
1890 | static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags) | |
1891 | { | |
1892 | } | |
1893 | static inline void rseq_execve(struct task_struct *t) | |
1894 | { | |
1895 | } | |
1896 | ||
1897 | #endif | |
1898 | ||
73ab1cb2 TY |
1899 | void __exit_umh(struct task_struct *tsk); |
1900 | ||
1901 | static inline void exit_umh(struct task_struct *tsk) | |
1902 | { | |
1903 | if (unlikely(tsk->flags & PF_UMH)) | |
1904 | __exit_umh(tsk); | |
1905 | } | |
1906 | ||
d7822b1e MD |
1907 | #ifdef CONFIG_DEBUG_RSEQ |
1908 | ||
1909 | void rseq_syscall(struct pt_regs *regs); | |
1910 | ||
1911 | #else | |
1912 | ||
1913 | static inline void rseq_syscall(struct pt_regs *regs) | |
1914 | { | |
1915 | } | |
1916 | ||
1917 | #endif | |
1918 | ||
1da177e4 | 1919 | #endif |